iOS Swift Alamofire缓存策略

在

Alamofire

Version3中，我使用

NSURLRequest.CachePolicy.returnCacheDataDontLoad

进行请求缓存

let URLRequest = NSMutableURLRequest(url: URL(string: url)!)
    URLRequest.cachePolicy = NSURLRequest.CachePolicy.returnCacheDataDontLoad
    Alamofire.request(URLRequest){...}

但是如何在Alamofire 4和swift 3中使用cachePolicy

---

谢谢

我到处搜索，结果是：

    let TheURL = DEFAULT_APP_URL + "api/getList?Id="+ID
    let urlString = NSURL(string: TheURL)
    var mutableURLRequest = URLRequest(url: urlString! as URL)
    mutableURLRequest.httpMethod = "GET"
    mutableURLRequest.setValue("application/json", forHTTPHeaderField: "Content-Type")
    mutableURLRequest.cachePolicy = NSURLRequest.CachePolicy.returnCacheDataElseLoad


    Alamofire.request(mutableURLRequest)
        .responseJSON
       {....}

---

这是我的工作代码

    private static func request(_ showHud: Bool = true, urlString: String,
                            httpMethod: HTTPMethod,
                            parameters: [String : Any] = [:],
                            headers: [String : Any] = [:],
                            success : @escaping SuccessBlock,
                            failure : @escaping ErrorBlock) {
    var additionalHeaders: HTTPHeaders?
    additionalHeaders = headers as? HTTPHeaders
    guard let url = URL(string: urlString) else { return }

    var urlRequest = URLRequest(url: url)
    if !(NetworkReachabilityManager()?.isReachable ?? false) {
        urlRequest.cachePolicy = .returnCacheDataDontLoad
    } else {
        showIndicator(showHud)
    }
    urlRequest.allHTTPHeaderFields = additionalHeaders
    urlRequest.httpMethod = httpMethod.rawValue
    do {
        urlRequest = httpMethod == .get ? try URLEncoding.default.encode(urlRequest, with: parameters) : try JSONEncoding.default.encode(urlRequest, with: parameters)
    } catch {
        failure(NSError(localizedDescription: "Something went wrong!"))
    }
    Alamofire.request(urlRequest).responseObject { (response: DataResponse<ResponseHandler>) in
        parseResponse(response, success: success, failure: failure)
    }
}

private static func请求（uuhud:Bool=true，urlString:String，
httpMethod:httpMethod，
参数：[字符串：任意]=[：]，
标题：[字符串：任意]=[：]，
成功：@escaping SuccessBlock，
失败：@转义错误块）{
var additionalHeaders:HTTPHeaders？
additionalHeaders=标题为？HTTPHeaders
guard let url=url（字符串：urlString）else{return}
var urlRequest=urlRequest（url:url）
if！（NetworkReachabilityManager（）？.isReachable？false）{
urlRequest.cachePolicy=.returnCacheDataDontLoad
}否则{
显示指示器（显示HUD）
}
urlRequest.allHTTPHeaderFields=附加标头
urlRequest.httpMethod=httpMethod.rawValue
做{
urlRequest=httpMethod==.get？尝试URLEncoding.default.encode（urlRequest，带：参数）：尝试jsonencodeding.default.encode（urlRequest，带：参数）
}抓住{
失败（N错误（本地化描述：“出现问题！”）
}
中的Alamofire.request（urlRequest）.responseObject{（响应：DataResponse）
parseResponse（响应，成功：成功，失败：失败）
}
}

关键是在从缓存加载数据之前，我检查了internet连接。如果internet可用，我将显示加载程序，它将加载api，如果不可用，它将从缓存中提供数据